#include <iostream>
using std::cout;
using std::endl;

namespace wd
{
int num = 100;

void func(){
    cout << "func" << endl;
}
}//end of namespace wd


void test0(){
    using namespace wd;
    cout << num << endl;
    func();
}

void test1(){
    //cout << num << endl;//error

}

int main(void){
    test0();
    return 0;
}
